using System;

public class Program

{

    static long Fact(int n)

    {

    if (n == 1 || n == 0)

    {

        return 1;

    }

        else 

        {

        return n*Fact(n-1);

        }

    }

    static long CC(int n , int r)

    {

    if (n<0 || r>n || r<0)

    {

        Console.WriteLine("cheak the number of n or r and try again");

    }

            return Fact(n) / (Fact(r) * Fact(n-r));

    }

    static long CP(int n , int r)

    {

    if (n<0 || r>n || r<0)

    {

        Console.WriteLine("cheak the number of n or r and try again");

    }

     return Fact(n) / Fact(n-r);

    }

​

    public static void Main()

    {

        Console.WriteLine("n =   ");

        int n = int.Parse(Console.ReadLine());

        Console.WriteLine("r =   ");

        int r = int.Parse(Console.ReadLine());

        long c = CC(n,r);

        long p = CP(n,r);

        Console.WriteLine("The C for ({0},{1}) is {2}", n , r , c);

        Console.WriteLine("The P for ({0},{1}) is {2}", n , r , p);

​

    }

}